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Old 14th November 2012, 01:28 AM   #2201
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I bought a set from another member just like these. I would say not Nelson approved... but I made a donation to this site to make myself feel better about it at least. Not to put words in Papa Pass' mouth, but I think he'd say that arrangement was less than ideal but acceptable. I hope.
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Old 14th November 2012, 06:34 AM   #2202
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Quote:
Originally Posted by Salomon View Post
Should the boards are approved?

Sorry for my post, if I made a mistake.
Now i can not erase it.
I noticed some postings in which pictures were shown from PCB that were obviously not made with permission of Nelson Pass. It resulted in forum members refusing to help with questions about building an amp with these boards. As far as I know/could find, there is no list of approved boards other than in the DIYaudio store. Because I am not an experienced builder the possibility is very real I need help with some problems I encounter when I decide to build an Aleph X. It would be dissapointing for me if I could not post my questions on this board.

Salomon, I hope you understand my question was not to attack you in any way.

OneplusTwo: I guess Nelson would understand


To continue with the Aleph X: As far as I understand these boards ARE approved: ALEPH-X - Pass Labs Clone Class-A amplifier PCB & schematic
Anyone experience with these?
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Old 17th November 2012, 06:36 AM   #2203
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Well, did some research and since Kristijans boards and web-adress are mentioned several times on the passdiy site, I guess they are approved although the discussions on DIYA sound different. (Or am I making this issue "bigger" than I should?)

@ Solomon: during my reading I found your Aleph X. Beautiful! Sorry to see your website is down.

Another question: I saw a lot of builders are using Macmillan resistors. I googled but no result. What are, where are Macmillan resistors.
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Old 4th December 2012, 06:51 AM   #2204
Salomon is offline Salomon  Germany
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Quote:
@ Solomon: during my reading I found your Aleph X. Beautiful! Sorry to see your website is down.
Now you find more pictures and several infomations about my Aleph-X here on this website:
Class A monster: Aleph-X by Horst Wolf Audio Tweak

My own Website with more infomation about my projects will be ready again in a few weeks.

Quote:
Another question: I saw a lot of builders are using Macmillan resistors. I googled but no result. What are, where are Macmillan resistors.
That is not difficult. But it would be nice if someone with better English knowledge then I could write the answer.
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Old 4th December 2012, 06:56 AM   #2205
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Thanks Horst! Amazing amp!
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Old 5th December 2012, 10:58 AM   #2206
CeeVee is offline CeeVee  Portugal
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Many Many commercial amps are not as well thought out.

Congratulations on a fantastic job.
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Old 19th December 2012, 05:54 PM   #2207
gl is offline gl  United States
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Quote:
Originally Posted by ijscobar View Post
Another question: I saw a lot of builders are using Macmillan resistors. I googled but no result. What are, where are Macmillan resistors.
I will try and answer your question.

The MacMillan resistors are named after Ian MacMillan, a member of this forum. On the large Aleph-X thread NP challenged the forum to discover a second method that he had employed to reduce absolute DC offset in the factory XA circuit. Ian won the contest by proposing the resistors that are now named after him.

My most recently published Aleph-X schematic is attached to the following post. The MacMillan resistors are labeled R46 and R47.

AX100 100W Aleph-X Monoblocks

This next post includes a discussion of my own experiments to find an optimum value for them. There is valuable follow on discussion and results from other builders.

AX100 100W Aleph-X Monoblocks

Please note that there is a large amount of inaccurate information around on Aleph-X circuit values. KK's site for instance is not high on my list of accurate information sources.

Graeme
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Old 19th December 2012, 06:37 PM   #2208
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Thanks Graeme,

It's a position and not a brand (as I thought it was). I'm afraid I'm more of a kitbuilder so I'm sorry to hear the KK site is not what it should be. I must say I almost bought PCB's there...
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Old 19th December 2012, 07:02 PM   #2209
gl is offline gl  United States
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Quote:
Originally Posted by ijscobar View Post
Thanks Graeme,

It's a position and not a brand (as I thought it was). I'm afraid I'm more of a kitbuilder so I'm sorry to hear the KK site is not what it should be. I must say I almost bought PCB's there...
His PCB's may be fine. They look nice. It's some of his schematics I question. KK is a layout guy. There is no evidence that he has ever actually built any of the projects embodied in his PCB's.

Graeme
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Old 20th December 2012, 06:57 AM   #2210
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I can confirm his PCB's are fine. I have build an Aleph 5 with his boards a couple of years ago. Sold the Aleph 5 and bought UCD400AD's. Now I'm looking for something wit a bit more power and it has to have balanced inputs. The 100W Alpeh-X seems like a good option. Now I have to find PCB's (with a bit of documentation since I'm not an electronics engineer) which seems to be a bit more difficult than I thought it would be...
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